US20040071811A1 - Rotational moulding machine - Google Patents
Rotational moulding machine Download PDFInfo
- Publication number
- US20040071811A1 US20040071811A1 US10/467,375 US46737503A US2004071811A1 US 20040071811 A1 US20040071811 A1 US 20040071811A1 US 46737503 A US46737503 A US 46737503A US 2004071811 A1 US2004071811 A1 US 2004071811A1
- Authority
- US
- United States
- Prior art keywords
- oven
- arm
- moulding machine
- rotational moulding
- mould
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/46—Heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/38—Moulds, cores or other substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
- B29C33/04—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/16—Cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
- B29C41/042—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould by rotating a mould around its axis of symmetry
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3462—Cables
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
A rotational moulding machine comprising: an oven; at least one arm arranged, in use, to rotate a mould within and relative to said oven, said at least one arm having: a connection portion for connecting said mould to said arm; a cabling receiving section for receiving cabling connected between outside of said oven and said connection portion; a first conduit portion for the flow therein of cooling fluid from outside of said oven into said oven towards said connection portion; and a second conduit portion for the return flow therealong of said cooling fluid from inside of said oven to outside of said oven: and a pump for pumping said cooling fluid through said first and second conduit portions; wherein, in use, the pumped flow of said cooling fluid through said first and second conduit portions serves to cool said connection portion and/or said cabling receiving section.
Description
- The present invention relates to improvements in rotational moulding machines, particularly, but not exclusively, to rotational moulding machines for providing more operator control during rotational moulding.
- Rotational moulding is a technique which is sometimes used to make large articles from plastics materials, for example septic tanks and kayaks. In the technique, a powdered plastics material is placed in a mould and the mould is rotated whilst being heated in an oven. The oven is heated to around 300° C. and the outside of the mould reaches a temperature of about 230° C. The plastics material inside the mould reaches a temperature of only about 180° C. which is the temperature necessary for melting the plastics material to a state in which it flows sufficiently. The duration of heating required depends on the size and intricacy of the mould and may be for as long as half an hour. After heating the mould must be cooled ideally during which rotation is continued. Cooling is often accomplished with the aid of cooling fans and may last for approximately fifteen minutes. This is described in U.S. Pat. No. 4,583,932 which is incorporated herein by way of reference. Both gas fired and infrared ovens can be used.
- Previously, to determine the correct moulding conditions including temperature and the rates of rotation of the mould in two directions (which may not be the same or indeed constant), it has been necessary largely to rely on trial and error. The conditions are often determined by problem areas of the mould which require the longest heating duration, for example.
- The present invention provides a rotational moulding machine comprising:
- an infra red oven;
- at least one arm arranged, in use, to rotate a mould within and relative to said oven, said at least one arm having:
- a connection portion for connecting said mould to said arm;
- a cabling receiving section housing cabling connected between outside of said oven and said connection portion;
- a first conduit portion for the flow therein of cooling fluid from outside of said oven into said oven towards said connection portion; and
- a second conduit portion for the return flow therealong of said cooling fluid from inside of said oven to outside of said oven; and
- a pump for pumping said cooling fluid through said first and second conduit portions; wherein, in use, the pumped flow of said cooling fluid through said first and second conduit portions serves to cool said cabling thereby to protect said cabling from high temperatures in said oven.
- The hereinafter described embodiment of the present invention allows for control cabling to be connected between the rotating mould inside the oven and the outside of the oven, enabling this cabling to be used, for example, to increase operator control of the moulding conditions. The control cabling is protected from the harsh high temperature environment inside the oven by a flow of cooling fluid. This opens up the possibility of providing control signals and power to thermocouples and/or additional heaters on or in the mould during use. The cooling fluid also helps to keep any bearings in the arm relatively cool so that lubricating grease does not melt and flow out of the bearing.
- The present invention will now be described by way of example only with reference to the following drawings in which;
- FIG. 1 is a schematic part cross-sectional side elevation of an embodiment of rotational moulding machine according to the present invention; and
- FIG. 2 is a schematic diagram of part of the rotational moulding machine of FIG. 1 showing in detail a cross-sectional side elevation of the connection portions.
- Part of a rotational moulding machine in accordance with the present invention is shown schematically in FIG. 1. A
mould 18 is situated within anoven 25. Themould 18 is rotatable around a first axis 13 and a second axis 17 orthogonal to the first axis. In the preferred embodiment theoven 25 is fixed to theground 26 and the oven is an infrared oven providing energy to themould 18 mainly by radiation from a plurality of infrared sources (not shown in FIG. 1) mounted on the oven's interior. Alternatively theoven 25 may be fired by other means, for example gas in which heat is mainly provided to themould 18 by convection from hot combustion gases. - The
mould 18 is supported in theoven 25 by afirst arm 2 a and asecond arm 2 b which are connected to opposite sides of themould 18. First andsecond arms vertical post 21 outside the oven. First and second arms are both generally L-shaped and are attached together at the ends of the bases 15 of the L's to form a generally U-shaped frame assembly. Themould 18 is positioned between the open ends of the U-shape. - By rotating first and
second arms second arms mould 18 is also rotated around the second axis 17. Although the preferred embodiment shows-a frame supporting a mould and rotating it in two orthogonal directions, the frame according to the present invention may in fact only provide rotation of the mould around only one axis and not provide any support to the mould. - Mould18 (which is removable from the
arms second arms second arms - Connection portions1 a, 1 b engage drivably with
attachment portions 9 a, 9 b which are fixed on opposing surfaces of themould 18. The connection portions 1 a, 1 b are arranged to drivably rotate themould 18. This allows the mould to be rotated around first axis 13. In this way, it is possible to rotate the mould around first axis 13 relative to first andsecond arms oven 25. - The first and
second arms post 21 and toothed ball bearing 28. A generally circular opening in the side wall of theoven 25, through which the arms fit, is covered with a generallycircular baffle 24 which forms part of the frame assembly or is attached thereto. The baffle serves to reduce the amount of heat lost through the opening in the side wall of theoven 25. - As better shown in FIG. 2 the inside of the vertical part of each of the L-
shaped arms member 100 to split the insides of thearms first conduit portion 105 and asecond conduit portion 107. The dividingmember 100 ends in the proximity of the connecting portion 1 a, 1 b such that the first and second conduit portions meet in the vicinity of connection portion 1 a, 1 b Although both of thearms member 100, many of the advantages of the present invention can be realised if only one arm has a first and second conduit portion. - The dividing
member 100 is arranged such that the upstream end of thefirst conduit portion 105 is in communication with ablower 23 on thepost 21 and the downstream end of thesecond conduit portion 107 is open to the surroundings outside of theoven 25 such that cooling gas is vented externally of the oven. The base parts (vertically as drawn in FIG. 1) of the L-shaped arms first conduit portion 105 only. In this way cooling air is blown by theblower 23 through thefirst conduit position 105 from outside of theoven 25 indirection 110 along the hollow and elongate section forming the first andsecond arms second conduit portions 107 indirection 112 to leave thearm portions second conduit portions oven 25 and themould 18 and runs in thefirst conduit portions 105 which act as cabling receiving sections. The cabling may also lie in thesecond conduit portion 107. - A typical flow rate of cooling fluid in the conduit portions is about 10,000 m3/h from a 4 kW blower. The precise flow rate may be adjusted by flaps. In this way the maximum temperature of the cooling fluid can be kept below about 60° C. Furthermore, by spray covering the outside of the arms in the oven with Aluminium, the resulting reflective surface can reflect infra red radiation thereby also helping to keep the temperature inside the arms low.
- In the preferred embodiment,
cabling 7, which lies in the second arm portion, is for providing power to extra heaters 118 provided on themould 18. Those extra heaters can be used to provide extra heating to parts of themould 18 which benefit from extra energy input in comparison to other areas. For example, this may be useful for intricate parts of themould 18 where plastic must coat thickly. - In the preferred embodiment,
cables 10 which pass throughfirst arm portion 2 a are designed forthermocouples 116 which are attached to themould 18. The information about the temperature of various parts of themould 18 to which the thermocouples are attached can be useful for controlling the heat input as well as the cooling, and/or varying the rates and/or direction of rotation; this helps to provide better control of the rotational moulding process. - The first and
second arms pinion 27 driven by themotor 22 engages the external cogs of ball bearing 28 attached co-axially with second axis 17 to the first andsecond arms ball bearing 28, and cooling air passes from theblower 23 into the portion of the twoaims first conduit portions 105. The connection ofcabling post 21 and the first andsecond arms oven 25 throughsecond conduits 107 leaves thearms - As is illustrated in detail in FIG. 2, rotation of the
mould 18 around the first axis 13 is accomplished by a second motor 14 (which may be a gearmotor) which is attached to thefirst arm 2 a outside of theoven 25. A driving belt 11, usable thanks to the cooling of the cooling fluid, is connected from the second motor 14 to apulley 12 in the connection portion 1 a. Thepulley 12 is attached to ashaft 5 a which drives themould 18 around the first axis 13. A secondrotating collector 210 on thesame shaft 5 a allows electrical connection of the thermocouples on the mould to the cabling in thefirst arm portion 2 a via brushes. - A similar rotating collector211 on
shaft 5 b and brush arrangement is used insecond arm portion 2 b for the connection ofcabling 7 to the heaters 118 on themould 18. - In the preferred embodiment, only one second motor14 is attached to the
first arm 2 a for rotating themould 18 relative to the first andsecond arm portions shafts elastic ring 4 in both connection portions 1 a, 1 b. In the illustrated embodiment aflange 6, attached to the end of theshafts mould 18. - If required, the
shaft 5 b of thesecond arm portion 2 b may be hollow such that gas may be provided throughrotating coupling 8 andpipes 121 to themould 18. Asimilar coupling 20 is provided on the supportingframe 21. For some moulding operations it is required that inert gas is provided to the inside of themould 18 to avoid oxidation and/or to help keep the polymer adhered to the inside wall of the mould. - Various passages machined in the axial direction through the
shafts collectors 210, 211 to themould 18. In the case of thethermocouple cabling 10, the cables to pass through thermocouple converters 9 after thecollector 210 before entering themould 18. The converters 9 are attached to the shaft Sa and rotate with it. - The provision of a flow of cooling fluid through the first and second conduits advantageously keeps rotating
collectors 210, 211, driving belt 11,pulley 12 andball race bearings 3 cool to prolong their lifetime and enhance their performance during operation.
Claims (19)
1. A rotational moulding machine comprising:
an infra red oven;
at least one arm arranged, in use, to rotate a mould within and relative to said oven, said at least one arm having:
a connection portion for connecting said mould to said arm;
a cabling receiving section housing cabling connected between outside of said oven and said connection portion;
a first conduit portion for the flow therein of cooling fluid from outside of said oven into said oven towards said connection portion; and
a second conduit portion for the return flow therealong of said cooling fluid from inside of said oven to outside of said oven; and
a pump for pumping said cooling fluid through said first and second conduit portions; wherein, in use, the pumped flow of said cooling fluid through said first and second conduit portions serves to cool said cabling thereby to protect said cabling from high temperatures in said oven.
2. A rotational moulding machine according to claim 1 , wherein said connection portion is rotatable relative to said arm about a first axis to rotate said mould relative to said at least one arm about said first axis.
3. A rotational moulding machine according to claim 2 , wherein said at least one arm is arranged to rotate said mould relative to said oven around a second axis which is substantially orthogonal to said first axis.
4. A rotational moulding machine according to claim 1 wherein said at least one arm is arranged to rotate said mould relative to said oven around a second axis.
5. A rotational moulding machine according to claim 3 or claim 4 , further comprising a first motor arranged to rotate each of said at least one arm around said second axis.
6. A rotational moulding machine according to any one of the preceding claims, further comprising;
a first arm and a second arm of said at least one arm;
said respective connecting portions of said first and second arms opposing each other in spaced apart relationship and arranged, in use, on opposing sides of said mould.
7. A rotational moulding machine according to any one of the preceding claims, further comprising a second motor connected outside of said oven to one of said at least one arms; and
a drive belt connected between said first motor and said connection portion; said connection portion thereby being rotatable by said second motor.
8. A rotational moulding machine according to any one of the preceding claims, wherein said first conduit portion and said second conduit portion are on opposite sides of said cabling receiving section.
9. A rotational moulding machine according to any one of the preceding claims, further comprising rotatable electrical connectors for connecting cables on said mould to said cabling in one of said at least one arms.
10. A rotational moulding machine according to any one of the preceding claims, wherein said at least one arm is a elongate, hollow and generally L-shaped.
11. A rotational moulding machine according to any one of the preceding claims, further comprising a rotatable conduit for, in use, providing fluid from one of said at least one arms to said mould.
12. A rotational moulding machine according to any one of the preceding claims, wherein said fluid is air.
13. A rotational moulding machine according to any one of the preceding claims, wherein said cabling receiving section is part of said first conduit portion.
14. A rotational moulding machine according to any one of claims 1 to 12 , wherein said cabling receiving section is part of said second conduit portion.
15. A rotational moulding machine according to anyone of claims 1 to 12 , wherein a dividing member divides part of said elongate, hollow and generally L-shaped at least one arm into said first and second conduit portions.
16. A rotational moulding machine according to claim 15 , wherein said divided part of said arms is in the vertical portion of said L-shape.
17. A method of cooling cabling housed in a cabling receiving section of an arm of a rotational moulding machine, said machine having an infra red oven, and said cabling being connected between outside of said oven and a connection portion connecting a mould inside said oven to said arm, said method comprising the steps of:
providing said arm with a first conduit portion for the flow therein of cooling fluid from outside of an oven towards an end of said arm connected to a mould in said oven;
providing said arm with a second conduit portion for the return flow therealong of said cooling fluid from inside of said oven to outside of said oven;
providing a flow of cooling fluid from outside of said oven to inside said oven through said first conduit portion and out of said oven through said second conduit portion to cool said cabling thereby to protect said cabling from high temperatures in said oven.
18. A rotational moulding machine substantially as herein before described with reference to and as illustrated in the accompanying drawings.
19. A method substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0103297A GB2372008A (en) | 2001-02-09 | 2001-02-09 | Rotational moulding machine |
GB0103297.8 | 2001-02-09 | ||
PCT/EP2002/001127 WO2002068170A1 (en) | 2001-02-09 | 2002-02-04 | Rotational moulding machine |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040071811A1 true US20040071811A1 (en) | 2004-04-15 |
Family
ID=9908469
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/467,375 Abandoned US20040071811A1 (en) | 2001-02-09 | 2002-02-04 | Rotational moulding machine |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040071811A1 (en) |
EP (1) | EP1360049A1 (en) |
GB (1) | GB2372008A (en) |
WO (1) | WO2002068170A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100166990A1 (en) * | 2007-04-30 | 2010-07-01 | Charles Caulder Bree | Rotationally moulded products and moulds |
US20170203477A1 (en) * | 2016-01-14 | 2017-07-20 | Tennant Company | Thread forming apparatus and method for rotationally molded product |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104118085B (en) * | 2014-07-01 | 2017-02-15 | 常州飞盛塑料机械有限公司 | Efficient energy-saving shuttle-type rotational moulding machine |
ITUB20159457A1 (en) * | 2015-12-15 | 2017-06-15 | Top Glass Eu Sa | Apparatus and process for making hollow elongated bodies of composite material |
ITUB20159703A1 (en) * | 2015-12-15 | 2017-06-15 | Top Glass Eu Sa | Apparatus and process for making hollow elongated bodies of composite material |
CN111805823B (en) * | 2020-07-09 | 2021-05-18 | 苏州巴涛信息科技有限公司 | Rotary mould for rotational moulding continuous forming |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3416193A (en) * | 1966-04-18 | 1968-12-17 | Faribo Mfg Company Inc | Rotational molding apparatus and mold therefor |
US3677670A (en) * | 1969-08-13 | 1972-07-18 | Sekisui Chemical Co Ltd | Rotational molding apparatus |
US3829272A (en) * | 1973-05-21 | 1974-08-13 | Mcneil Corp | Rotational molding machine |
US4043721A (en) * | 1968-07-11 | 1977-08-23 | Lemelson Jerome H | Composite body molding apparatus |
US5718929A (en) * | 1995-03-27 | 1998-02-17 | Rogerson; L. Keith | Rotational molding apparatus having fluid cooled arms |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3350745A (en) * | 1966-05-26 | 1967-11-07 | Nat Distillers Chem Corp | Rotational molding |
JPH09159092A (en) * | 1995-12-06 | 1997-06-17 | Yamatake Honeywell Co Ltd | Forming method and device for pipe body lining |
-
2001
- 2001-02-09 GB GB0103297A patent/GB2372008A/en not_active Withdrawn
-
2002
- 2002-02-04 US US10/467,375 patent/US20040071811A1/en not_active Abandoned
- 2002-02-04 EP EP02710836A patent/EP1360049A1/en not_active Withdrawn
- 2002-02-04 WO PCT/EP2002/001127 patent/WO2002068170A1/en not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3416193A (en) * | 1966-04-18 | 1968-12-17 | Faribo Mfg Company Inc | Rotational molding apparatus and mold therefor |
US4043721A (en) * | 1968-07-11 | 1977-08-23 | Lemelson Jerome H | Composite body molding apparatus |
US3677670A (en) * | 1969-08-13 | 1972-07-18 | Sekisui Chemical Co Ltd | Rotational molding apparatus |
US3829272A (en) * | 1973-05-21 | 1974-08-13 | Mcneil Corp | Rotational molding machine |
US5718929A (en) * | 1995-03-27 | 1998-02-17 | Rogerson; L. Keith | Rotational molding apparatus having fluid cooled arms |
US5728423A (en) * | 1995-03-27 | 1998-03-17 | Rogerson; L. Keith | Method and apparatus for internally and externally coating enclosed metallic structures |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100166990A1 (en) * | 2007-04-30 | 2010-07-01 | Charles Caulder Bree | Rotationally moulded products and moulds |
US20170203477A1 (en) * | 2016-01-14 | 2017-07-20 | Tennant Company | Thread forming apparatus and method for rotationally molded product |
US11224998B2 (en) * | 2016-01-14 | 2022-01-18 | Tennant Company | Thread forming apparatus and method for rotationally molded product |
Also Published As
Publication number | Publication date |
---|---|
WO2002068170A1 (en) | 2002-09-06 |
GB2372008A (en) | 2002-08-14 |
GB0103297D0 (en) | 2001-03-28 |
EP1360049A1 (en) | 2003-11-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |